Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28b5416adbe10e9…

MALICIOUS

PDF

82.8 KB Created: 2021-08-19 21:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc0fad06a47dca8ebff2f6a7565114e8 SHA-1: 12ff25964a645bbf009626ce7926f54b29ccda50 SHA-256: f28b5416adbe10e92a90dbd43040448397292b2050846299ab82275c6e5fa944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The document body is unreadable, but the heuristic findings and URL analysis are sufficient to classify this as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a8656917f3e6b1bbc34751cb6e0795e3/6585557455.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a142a94d0ea443985ce0962cefe16707/36823828244.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/gf1i2s56ue2vibfpj0g21kt4r6/dasobawo.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06ecad44e---timimijaziwoparosidofozap.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d64b43b73b---zoxedibetezodapopabotaxik.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/leeplfg91nphjj85hrqncujs4g/95259699057.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/hac7ro98alfraa2s6mq9jr6p7i/kusulolugolefemilubozozeb.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/31745071387.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/cb87a658965b5d152cd94a837257b2d9/fomevodixesaga.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/010525276767.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/gofafororuzowewizukes.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a2022b05a91e835588560bebcf92989f/95510376311.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0e1b32c2d---12522848580.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/96230748690.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/xorobomolitoliwef.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/2990141655.pdfIn PDF document text
    • https://ka-base.no/images_content/file/lefaga.pdfIn PDF document text
    • http://elma1.ru/!upload/files/tobitijoxabituratates.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/1a6fdfe29270b22b82ee1c45c5b73dc0/pigosu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f4c5b2fc6b8352cedc201588afef53b0/90007835940.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/93364efe0fce01cfe6b34ea1217a0f0c/89622067533.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/rufikupasedapukimepimusur.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/085e6356011b00228356efa8e569220b/zamapagukujuxer.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/bexufesabiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=kambu+dosa+preparation+in+tamilPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14D 16516 bytes
SHA-256: 1354238b6a5b71150c769cd5141ef8a185c130318f242186c5877d834e7169b2
font_01_sfnt_off00010c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 10784 bytes
SHA-256: 10a7adf73ccfe514f843ab41d179eb54cfb53dec70f575a37cb58c30508f4e7f
font_02_sfnt_off000124ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.